From 3807217d028dd00ba3d7c3476f226c9d12d52007 Mon Sep 17 00:00:00 2001
From: Adrian Prantl <aprantl@apple.com>
Date: Fri, 24 Aug 2018 21:01:58 +0000
Subject: [PATCH] Verifier: verify that a DILocation's scope is a DILocalScope.

This fixes an assertion failure(!) in the Verifier.

rdar://problem/43687474

llvm-svn: 340653
---
 llvm/lib/IR/Verifier.cpp               |  4 ++++
 llvm/test/Verifier/DILocation-scope.ll | 24 ++++++++++++++++++++++++
 2 files changed, 28 insertions(+)
 create mode 100644 llvm/test/Verifier/DILocation-scope.ll

diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index 5bc731c32664..2dcb9c4adf8d 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -2264,6 +2264,10 @@ void Verifier::visitFunction(const Function &F) {
       if (!Seen.insert(DL).second)
         continue;
 
+      Metadata *Parent = DL->getRawScope();
+      AssertDI(Parent && isa<DILocalScope>(Parent),
+               "DILocation's scope must be a DILocalScope", N, &F, &I, DL,
+               Parent);
       DILocalScope *Scope = DL->getInlinedAtScope();
       if (Scope && !Seen.insert(Scope).second)
         continue;
diff --git a/llvm/test/Verifier/DILocation-scope.ll b/llvm/test/Verifier/DILocation-scope.ll
new file mode 100644
index 000000000000..5cac5aead82d
--- /dev/null
+++ b/llvm/test/Verifier/DILocation-scope.ll
@@ -0,0 +1,24 @@
+; RUN: llvm-as -disable-output %s -o - 2>&1 | FileCheck %s
+source_filename = "t.c"
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx10.13.0"
+
+define void @f() !dbg !4 {
+entry:
+; CHECK: scope must be a DILocalScope
+; CHECK: DILocation
+  ret void, !dbg !6
+}
+
+; CHECK: warning: ignoring invalid debug info
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!2, !3}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, emissionKind: FullDebug)
+!1 = !DIFile(filename: "t.c", directory: "/tmp")
+!2 = !{i32 2, !"Dwarf Version", i32 4}
+!3 = !{i32 2, !"Debug Info Version", i32 3}
+!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !5, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, unit: !0)
+!5 = !DISubroutineType(types: !{})
+!6 = !DILocation(line: 2, scope: !1)